TSB has apologized to its customers for not being able to use their digital banking services on Thursday morning.
This happened after TSB faced an IT collapse last year that left thousands of people with access to its online banking services.
The latest issues were started on the mobile app and the web site at around 4 am and fixed three hours later.
TSB said the problem was due to routine maintenance planned at the time.
People expressed their disappointment with the latest news on Twitter and said, "Oh, let's go again, the TSB bank is down, time for a change, I think!"
Another said, "#TSB can not access my online banking again, which is far too common these days, and I think it's time for a bank transfer."
The problems of last year were caused by a botched attempt at technology migration.
The ranking of the bank has fallen after several IT problems. In a recent survey conducted by Ipsos MORI, the bank ranked 12th out of 15 UK banks.
A TSB spokesperson said, "We are aware of a temporary problem that affected a small number of customers who attempted to access their mobile and online banking this morning.
"We can confirm that the problem has now been resolved and we apologize for any inconvenience."
The company has enjoyed a largely stable service in recent months, with few minor incidents.